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NEET 2026
Exam
NEET
Year
2026
Subject
Physics
Chapter
Chapter

NEET 2026 · Physics · Chapter

An ideal step-down transformer is connected to a 3300 V...

An ideal step-down transformer is connected to a 3300 V3300 \text{ V} transmission line. It is used to power a 220 V220 \text{ V}, 66 W66 \text{ W} electrical appliance. What is the current drawn by the primary coil of the transformer?

Options

  1. A0.3 A0.3 \text{ A}
  2. B20 mA20 \text{ mA}
  3. C0.2 A0.2 \text{ A}
  4. D2 A2 \text{ A}

Correct answer

B. 20 mA20 \text{ mA}

Step-by-step solution

For an ideal transformer, the input power to the primary coil is equal to the output power from the secondary coil.

Pp=PsP_p = P_s

VpIp=PsV_p I_p = P_s

Substituting the given values:

3300×Ip=663300 \times I_p = 66

Ip=663300I_p = \dfrac{66}{3300}

Ip=0.02 AI_p = 0.02 \text{ A}

Ip=20 mAI_p = 20 \text{ mA}

Answer: 20 mA20 \text{ mA}
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